Q: Which of the following is the correct formula for density?

$d = \dfrac{\text{mass}}{\text{volume}}$

Question 1

Which of the following statements about scientific laws and theories is CORRECT?

Accepted Answer

A scientific law summarizes observations but does not explain why they occur.

Question 2

Which of the following is an example of an intensive property?

Accepted Answer

Density

Question 3

A student measures the mass of a cube of lead with an edge length of 1.0 inch. The density of lead is $11.34\ \mathrm{g/mL}$. What is the mass of the cube in grams? (Use $1\ \mathrm{in} = 2.54\ \mathrm{cm}$ and $1\ \mathrm{cm}^3 = 1\ \mathrm{mL}$)

Accepted Answer

$190\ \mathrm{g}$

Question 4

Which of the following is NOT a physical property?

Accepted Answer

Ability to react with oxygen

Question 5

Which of the following is classified INCORRECTLY?

Accepted Answer

The air in a room = heterogeneous mixture

Question 6

A sample of bronze alloy contains $78\%$ by mass copper. If the density of the alloy is $8.52\ \mathrm{g/mL}$, what volume of bronze contains $13.46\ \mathrm{g}$ of copper?

Accepted Answer

$2.0\ \mathrm{mL}$

Question 7

Which of the following measurements has the WRONG number of significant figures?

Accepted Answer

$350.09\ \mathrm{g}$\ (4\ SF)

Question 8

Which of the following is a correct conversion factor for $1\ \mathrm{kg}$?

Accepted Answer

$\dfrac{1000\ \mathrm{g}}{1\ \mathrm{kg}}$

Question 9

Which of the following is TRUE about separating mixtures?

Accepted Answer

Paper chromatography separates substances based on their preference for stationary vs. mobile phases.

Question 10

Which of the following statements about energy is INCORRECT?

Accepted Answer

Energy can be created or destroyed in a chemical reaction.

Question 11

Which of the following is an example of a chemical property?

Accepted Answer

Iron tends to react with oxygen to form rust.

Question 12

Which of the following is a derived SI unit?

Accepted Answer

Joule ($\mathrm{J}$)

Question 13

Which of the following statements about significant figures is TRUE?

Accepted Answer

Interior zeros (between nonzero digits) are always significant.

Question 14

A student adds $8.6\ \mathrm{cm}$, $3.3\ \mathrm{cm}$, and $5.1\ \mathrm{cm}$. What is the correct sum, rounded to the proper number of significant figures?

Accepted Answer

$17.0\ \mathrm{cm}$

Question 15

Which of the following is an example of a homogeneous mixture?

Accepted Answer

Black coffee

Question 16

Which of the following is the correct formula for density?

Accepted Answer

$d = \dfrac{	ext{mass}}{	ext{volume}}$

Question 17

Which of the following is an example of a systematic error?

Accepted Answer

A thermometer consistently reads $2^\circ\mathrm{C}$ too low.

Question 18

Which of the following is the correct relationship for converting Celsius to Fahrenheit?

Accepted Answer

$T_F = 1.8T_C + 32$

Question 19

Which of the following is an example of a crystalline solid?

Accepted Answer

Diamond

Question 20

Which of the following statements about precision and accuracy is TRUE?

Accepted Answer

Precision is the repeatability of measurements; accuracy is how close measurements are to the true value.

Chapter 1: Matter, Measurement, and Problem Solving – Study Notes

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